Where Clause with AND Statement in Python

JoeBorgione — Sat, 11 Dec 2021 23:48:20 GMT

In Adding to a Selection I asked how to pass a variable set in a search cursor to a where statement. Curtis Price helped me there. That turned out to be only half of what I need in the particular application I'm working on: I also need to incorporate an AND statement into the WHERE clause. It's all about pythons' love of lists...

Curtis provided the initial where clause and I expand upon it below:

where = "FullStreet IN ({})".format(street_list)
#which creates a selection where FullStreet is a member of street_list
# I change his where variable to this:
where = "FullStreet IN ({}) AND numeric_hn <=({}) AND numeric_hn >= ({})".format(street_list,max,min)
# so I'm selecting not only for the FullStreet value, but checking for a house number value that
#is GTE and LTE to specified values
arcpy.SelectLayerByAttribute_management ("apLayer","ADD_TO_SELECTION",where)
#And I'm golden!

For the newbie like myself, each of the ({}) gets populated with the corresponding (in order) list member. So:

FullStreet IN ({street_list})

and

numeric_hn <= ({max})

and

numeric_hn => ({min})

Is how the where statement is being interpreted.

Lessons learned:

Quote positions are critical

The .format method is your friend. Sometimes he can be a difficult friend, but he's a friend.

Python is all about lists. Don't overlook or forget that.

Kudos to Ryan Sadler‌ for teaching this old dawg a new trick

Darren Wiens‌ , Rebecca Strauch, GISP‌

Re: Where Clause with AND Statement in Python

DanPatterson_Retired — Mon, 11 Sep 2017 18:07:47 GMT

Check out Fancy, Fancy Formatting and the links in there on Basic Fancy Formatting etc.

As you move to python 3, this will become more useful over time,

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Where Clause with AND Statement in Python

Re: Where Clause with AND Statement in Python